Question

Statement I: Acid strength increases in the order given as HF << HCl << HBr << HI.

Statement II: As the size of the elements F, Cl, Br, and I increase down the group, the bond strength of HF, HCl, HBr and HI decreases and so the acid strength increases.

In the light of the above statements, choose the correct answer from the options given below.

Options

• Statement I is incorrect but Statement II is true.

• Both Statement I and Statement II are true.

• Both Statement I and Statement II are false

• Statement I is correct but statement II is false.

Answer 1

Both Statement I and Statement II are true.

Explanation:

The acid strength of hydrogen halides increases from HF to HI due to the decreasing bond strength of H-X bonds down the group. As the atomic size increases from F to I, the H-X bond becomes weaker, making it easier to ionise in water and release H⁺ ions, thus increasing acid strength.